lorenznew's profile - activity

Bad results with Gmapping Hey everyone, I've got some trouble with gmapping. I'm Using a robot called "eddie" witch

Bad results with Gmapping Hey everyone, I've got some trouble with gmapping. I'm Using a robot called "eddie" witch

Bad results with Gmapping Hey everyone, I've got some trouble with gmapping. I'm Using a robot called "eddie" witch

Bad results with Gmapping Hey everyone, I've got some trouble with gmapping. I'm Using a robot called "eddie" witch

same problem here, any ideas?

Serial communication with multiple nodes hey, I've got a short question. When i have two nodes, both want to communicat

The Nodes are running on one PC and would like to communicate to external Hardware, such as a control board used for rea

Serial communication with multiple nodes hey, I've got a short question. When i have two nodes, both want to communicat

Serial communication with multiple nodes hey, I've got a short question. When i have two nodes, both want to communicat

Hello everyone,

I try to get the navigation Stack with gmapping running on my robot. The odometry and Gmapping are very good as long as I move the robot with my keyboard.

As soon as I give the first navigation goal, the robot starts moving, but the position in the map is not updated until move_base stops its navigation. Btw. the robot does not reach its goal, but the direction is right. So it seems like the controlling by the navigation stack does block the new odometry information.

I think that could happen because the serial connection to my hardware-control-board (which is controlling sensors+motors) cant handle the odometry and the navigation communication togther. Important to say is, that odometry and keyboard control are working fine together

So my question is: Is there a way to recuce the frequency of the cmd_vel msgs published by the navigation stack?

or does anyone have an other idea what could be wrong?!

thanks so much Lorenz

hello,

I had to re-install my Ubuntu 16.04 with kinetic for some reasons. How ever, I tried to re-install all the work I've done before on the project. All the workspaces where saved in my onwcloud, so i thought it should be an easy thing to do. Wrong :)

As I tried just to recompile the workspace with catkin_make everything failed an i tried to build from a new and clean workspace. There is a node that uses some serial communication,so i need to add the rosserial pkg to my system. First try by sudo apt-get install ros-kinetic-serial. then I did catkin_make. Everything fine so far. BUT when i start the node with rosrun an exeption ocoured:

IO Exception (13): Permission denied, file /tmp/binarydeb/ros-kinetic-serial-1.2.1/src/impl/unix.cc, line 151.

Just to check, i manually install the serial-pkg in my workspace and build both mith catkin. Now ther ist that error:

IO Exception (13): Permission denied, file /home/eddie/owncloud/eddie_ws/src/serial/src/impl/unix.cc, line 151.

which is basicly the same.

The piece of code with this revers to ist that: (l.151 is the default case)

void
Serial::SerialImpl::open ()
{
  if (port_.empty ()) {
    throw invalid_argument ("Empty port is invalid.");
  }
  if (is_open_ == true) {
    throw SerialException ("Serial port already open.");
  }

  fd_ = ::open (port_.c_str(), O_RDWR | O_NOCTTY | O_NONBLOCK);

  if (fd_ == -1) {
    switch (errno) {
    case EINTR:
      // Recurse because this is a recoverable error.
      open ();
      return;
    case ENFILE:
    case EMFILE:
      THROW (IOException, "Too many file handles open.");
    default:
      THROW (IOException, errno);
    }
  }

  reconfigurePort();
  is_open_ = true;
}

Does anyone has any ideas? thank you all! p.s. the hole thing worked very good before the re installation.

Hi! I try to get the navigation stack running on my robot. I've got ROS running on the robot and on an PC used for visualization in Rviz and, if possible, for calculation like gmapping.

Nodes i need: odometry_publisher; base_control; tf_broadcaster; rviz; gmapping; depth_to laserscan; freenect(kinect); move_base.

I tried to distribute the nodes on the two PC in so may different combinations. But i allways get the same problem:

When i start all the nodes on my robot like: Odometry_publisher, freenect(kinect) and base_control everything looks good. Then i start the rest of the nodes on the other PC.

In rviz it needs one minute until the laser scan in shown( before it tells that there is no transform from base_link to map). even if the laser scan is not visible in rviz, gmapping is building map After that minute all of my nodes work fine. the is tha map made by gmapping and all the sensordata is published.

BUT: Starting the Navigation stack produces that Warning and does nothing afterwards:

 [ WARN] [1532685774.079683838]: Timed out waiting for transform from base_link to map to become available before running costmap, tf error: Lookup would require extrapolation into the past.  Requested time 1532685692.802003361 but the earliest data is at time 1532685767.757000016, when looking up transform from frame [base_link] to frame [map]. Transform returned after 0.100864 timeout was 0.1.

btw i does make no change where the master runs I think my time is completely messed up. anyone an idea how to fix that?

thanks you so much!

Hello everyone! I got this working! As gvdhoorn sad, the machines where not in sync! To solve this: try ntpdate -q <

WOW! nice! Thank you! I found the solution thanks to your comment! Just need to do: sudo adduser <second_user> dia